48094domain: NAppears in sequencesHeptagonal numbers (A000566) with prime indices (A000040).at n=33A346494a(n) = Sum_{k=0..n} (n - k)! * k! / floor(k / 2)!^2, row sums of A349269.at n=8A349270Heptagonal numbers which are products of three distinct primes.at n=29A356422